User Manual for Telefunken KT88-TK Black Diamond Series Vacuum Tubes Click to enlarge the picture
Contents of the user manual for the Telefunken KT88-TK Black Diamond Series Vacuum
- Product category: Tube Microphones Telefunken
- Brand: Telefunken
- Description and content of package
- Technical information and basic settings
- Frequently asked questions – FAQ
- Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
- Authorized service for Telefunken Tube Microphones
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User manual for the Telefunken KT88-TK Black Diamond Series Vacuum contain basic instructions
that need to be followed during installation and operation.
Before starting your appliance, the user manual should be read through carefully.
Follow all the safety instructions and warnings, and be guided by the given recommendations.
User manual is an integral part of any Telefunken product,
and if it is sold or transferred, they should be handed over jointly with the product.
Following the instructions for use is an essential prerequisite for protecting
health and property during use, as well as recognition of liability on the part of the manufacturer
for possible defects should you make a warranty claim. Download an official Telefunken user manual in which you will find instructions on how to install, use, maintain and service your product.
And do not forget – unsuitable use of a Telefunken product will considerably shorten its lifespan!
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Product description This matched pair of Telefunken KT88-TK Black Diamond Series Vacuum Tubes is ideal for use in guitar amplifiers and hi-fi power amps in homes, studios, and live stage applications. For personal enjoyment or commercial recording, they grant the signature KT88 midrange with the added benefit of expanded low and high frequencies. Among the largest in their class, these beam-power tetrode tubes deliver high power and low distortion while handling plate voltages up to 800V. Depending on the circuit type, they can be used as beam-power tetrodes or output-beam pentodes. - Newly manufactured and cryogenically treated version of the legendary KT88
- Beam-power tetrode tube design similar to the 6L6 and EL34
- Great for guitar amps and hi-fi power amplifiers
- One of the largest tubes in its class
- Handles plate voltages up to 800V
- High power and low distortion make it ideal for scenarios where higher gain with less distortion than a 6550 is desired
- Yields the characteristic midrange of the original KT88 manufactured by MOV (Marconi-Osram Valve) plus expanded low and high frequencies
- Each tube is meticulously measured for all critical parameters of performance including transconductance, gain, noise, and microphonics
- Tubes are selected by hand, rigorously tested, subjected to an extended burn-in period for stability, and remeasured before final packing
Table of Contents
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Technical parametersTelefunken MATCHED PAIR OF KT88-TK Specs | | | Type | A.F. beam pentode | | Base | Octal | | Number of Pins | 7 | | | | Voltage | 6.3 V | | Current | 1.6 A | | | | Capacitance | Grid #1 to All Except Plate: 16.5 pF
Plate to All Except Grid #1: 10 pF
Plate to Grid #1: 2.3 pF | | | | Voltage | Plate Voltage: 800 V
Grid #2: 600 V
Plate to Grid #2 Voltage: 600 V
Grid #1 Voltage (Negative Bias Value): -200 V
Cathode to Filament Voltage: 250 V | | Current | Cathode Current: 230 mA | | Dissipation | Plate Dissipation: 42 W
Grid #2 Dissipation: 8 W | | | | Voltage | Plate Voltage (Pentode Connection): 250 V
Grid #2 Voltage (Pentode Connection): 250 V
Grid #1 Voltage (Pentode Connection): -15 V
Grid #1 Voltage (Triode Connection): -15 V
Plate to Grid #2 Voltage (Triode Connection): 250 V | | Current | Plate Current (Pentode Connection): 140 mA
Grid #2 Current (Pentode Connection): 7 mA
Plate to Grid #2 Current (Triode Connection): 147 mA | | Transconductance | Pentode Connection: 11.5 mA/V
Triode Connection: 12 mA/V | | Resistance | Internal Plate Resistance (Pentode Connection): 12 kOhms, approximate
Internal Plate Resistance (Triode Connection): 670 Ohms | | Amplification | Amplification Factor (Pentode Connection): 8
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